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. Author manuscript; available in PMC: 2014 Nov 10.
Published in final edited form as: Commun Pure Appl Math. 2013 Jun 26;66(9):1464–1494. doi: 10.1002/cpa.21469

Figure 1.1.

Figure 1.1

A: Excitability in response to a brief current pulse (duration, 1 ms) for the Hodgkin-Huxley (HH) model. Weak pulse (Iapp = 5 μA/cm2) gives subthreshold response. Large enough pulse (Iapp = 20 μA/cm2) elicits a single spike, with response-amplitude nearly independent of input strength (if Iapp exceeds critical value). B: Repetitive firing in the HH model in response to steady current for Iapp with values in a certain range. Firing frequency increases with Iapp. Time bar, 10 ms. (Adapted from [4, figs. 1 and 5] with permission from Elsevier.)